Steam-generator.



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L. STEINMLLEP..

STEAM GENERATOR.

APPLIGATION FILED SEPT. 27, 1912.

Patented Aug. 5, 1913.

entran sTATns PATENT onirica.

LEBRECHT STEINMLLER, F GUMMEBSBACH, GERMANY.

STEAM-Galiana'Toi:k

specicatontf Letters Patent.

Patented Aug. 5,1913.

.Application filed September 27, 1912. Serial No. 722,769.

To all whom it may concern:

Be it known that I, LEBRECHT STEIN- Mr'tLLER, subject of the King of Pruss1a,re siding at Gummersbach, in the Province of the Rhine, German Empire, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specication.

This invent-ion relates to steam generators of the type described in. the specification of my prior United States patent application Serial No. 651,599, tiled September 27th, 1911, and the object of the present invention is to enable the intermediate heater described in my aforesaid patent specification to be used in conjunction with steam generators having two or more boiler elements which are heated to different temperatures, and particularly of the kind in which the boiler elements 'comprise inclined and more or less Vertical water tubes.

According to the present invention the intermediate heater is arranged between thel upper drums of the water tube elements in such a manner that the wettest saturated steam generated in the most highly heated boiler element passes entirely through the heater and is dried or superheated therein, p while the drier saturated steam generated in' the less'highly heated boiler element or lelements is either not passedl through the heater at all, or only caused to pass through part of'the heater. By this means, when heavy work is put upon the boiler, in which case the degree of su rheating is considerably increased, chie y wet steam will be e 'caused to enter the heater from the most highly heated lboiler element, and thus more heat will be taken from the superheated steam 4passing through and heating up the heater, so that in this manner, within ceri l tain limits, the temperature of the superheated steam will be automatically regulated. Furthermore, only that steam asses' through theheater which is most e ective in the exchange of heat therein, that is to' say,

the supersaturated steam, sothat the heater may be made smaller and radiation and pressure losses in the heater will consequently less than if the whole of the steam generated by the steam generator is caused to pass through the heater. A considerable reduction in the loss due to radialess highly heated element, will insure quieter ebullition in the upper drum of the most highly heated element and in consequence thereof, driersteam will be generated.

In most cases the excess heat in the superheated steam passing through the. heater will be sufficient to vaporize the whole of the water contained in the saturated steam, but if this is not the case, part of the water can be separated and returned to the boiler.

In order that the invention may be more clearly understood, reference is made to the accompanying drawings, which show, more or less diagrammatically, the application of 'my invention to one type of water tube' steam generator.

-In the drawings the intermediate heater b is arranged above and betweenl the upper water drums d and e ofthe water tube elei ments d e respectively, the heater being connected to the `water drum d by way of a pipe a and to the water-drum e through a connection f. Apipe u connects the heater b with the superheater g which in this case isv shown outside the boiler for the sake of clearn'ess. The superheater is connected by a return pipe u to the heater b inthe manner described in my aforesaid .patent speciication, the said heater comprising tubes b through which the wet steam passes, while the superheated steam entering the heater by way of the pipe u passes around the tubes bf and around a bale plate h tothe steam supply pipe w. v The particularly wet steam generated in the upper drum d passes by way of the pipe ldry steam coming from the upper drum e whereupon the mixturepasses through the tube u to the superheater g and from thence through the return tube u to and around the tubes b, where the temperature of the now superheated steam is slightly diminished previous to passing away by Way of the pipe fw. I

Should more water enter the heater b than can be vaporized therein, the excess Water can How through the connection f int the upper drum e and there be vaporize If desired the upper drum e may be connected to the pipe u through a pipe u2 'and a three-Way valve g may be arranged at the junction of the pipes so that the pipes u and u2 may be either independently or simultaneously put into communication with the 'superheater g. When only the pipe u2 is in communication with the superheater g through the valve Aq, the whole of the steam dried and slightly superheated in the heater will first of all pass through the upper drum e Where it will be cooled and again moistened before passing to the superheater.

By regulating the passage of the steam to the superheater in this manner, it is possible to prevent any burning out of the superheater tubes even if heavy work is put upon the boiler inasmuch as the whole of the steam can be passed through the superheater in moist condition and at the temperature of saturation, so that the temperature of the uperheated steam may be reduced without oss.`

It will of course be understood that the invention can also be applied to steam generators having more than two upper drums by conducting the generatedsteam through a larger or smaller part of the heater according to its degree of wetness.

' I claim l. The combination with a steam generator having a plurality of water tube elements heated by gases of different temperature and connected to separate upper water l drums, and a superheater; of a heater heated by the superheated steam from said superheater and connected to said water drums 1n such a manner that the wetter steam generated in the more highly heated Water tube elements passes through a larger part of said heater than the drier steam generated in the less highly heated water tube elements.

2. Thecombination with a steam generator having a plurality of water tube ele-v ments heated by gases of different temperature and connected to separate upper water drums, and a superheater; -of a heater heated by the superheated steam from said superheate'r and connected to said drums in such a manner that the wettest Steam generated in the most highly heated water-tube element passes through the entire heater while the driest steam generated in the least highly heated Water tube element passes direct to Said superheater.

3. The combination with a steam generator having a plurality of water tube elements heated by gases of diii'erent temperature and connected to separate upper water drums, and va superheater of a heater heated by the su erheated steam from said superheater an connected to said water drums in.

'ator having a plurality of water tube elements heated by gases ot different temperature and connected to separate upper water drums, and a superheater; of a heater heated by the superheated steam from said superheater and connected to said superheater and to said drumsin such a manner that the wettest steam generated in the most highly heated water tube element passes through the entire heater while the driest steam generated in the least highly heated water tube element passes direct to said superheater.

5. The combination with a steam generator having a plurality of water tube elements heated by gases of diiterent temperavture and connected to separate upper water drums, and a superheater; of a heater heated by the superheated steam from said superheater and connected to said water drums in such a manner that the wetter steam generated in the more highly heated water tube element passes through a larger part of said heater than the drier steam generated in the less highly heated water tube elements, a connection between the water drum of the least highly heated element and said superheater, and valve means for controlling communication between said superheater and the water drum of the least highly heated element.

6. The combination with a steam generatorv having a plurality of water tube elements heated by gases of different temperature and connected to separate upper'water drums, and a superheater; of a heater heated by the superheated steam from said superheater and connected to said drums and superheater in such a manner that the wettest 'moet highly heated passere through the ene des steam generated Water tube eieinent passes f y superheater, and veive ineens ier ecntroliing communication between seid superliee'e and hee ter end between Seid euperlienter und the Water drum or" the leest highly heated element.

.7. Vihe ccmbinetion with e steam generetcrhavingg e. plurality of water tube elements connected 'to upper Water drums, and a superlieeter; oi' a hesiter heated by the eupeibeeted steam from said Superheeter and connected to said Water drums in euch e manner that the wetter Steam passes through a. larger part of Said heater than the drier Steam, seid heater being declined toward the ccoleet Water drum so as to be capable of diechargingn "veter their-ei* 8. rThe ccmbiuetn steam generator having :i pim, ,y Ner tube elements connected to upper drums, and

Superheater; of e heater by the superheztted steam from seid euperlleeter and connected to Said drums in such e manner tlietnthe wettest steam passes through the entire heater While the driest steam passes direct to said Superbeater? said beater being declined toward the coolest Water drum so as to be cepeble of discharging Water thereinto.

9. The combination with Steele gencrater having e plurality of water tube eiements connected Lte upper Water drinne.l1 end a sugerheater; of e heater cempieing beeting space and a drying space 'the drying space being connected to Said drums in sucli :i manner that the Wetter steam passes through e. larger partv of said di Space than the dri'v steam, and e cene Seid supeiie r te seid he .nw

'lll The c inetien with e erete bevi W e euch e meneer the* entirely tliougi e necticn betyree the perbeziter to seid heating Space, and valve ineens for c-ontroliing ccinmcnceioii be tween seid superiieater and drying .Space and between seid euperiieeter and coolest Water drum.

l2. cembinetion with a Steam gemerater having a plurality of Wetertibe elemente connected to upper Water drums, and a superheeter; of a heater comprising e. beeting space and a drying space, the drying space being connected tc Seid superheete: and to seid drums in such a manner that the Wettest steam passes entirely through seid drying space, e connection between the coelest drum and Seid superlieeter7 e, connection from seid e 'perlieater te said beet-ing Space, and valve :means 'for controlling communiceticn betweeen said euperlieete drjz cuece end betweeii seid eupegnceter Weten drum,

i3. The combination with e eL erator "caving a plurality c* ife mente connected to upper superheeter; of e heater comprising; heating Space and a drying; space lie drying space being connected seid drums in euch e manner that the Wetter e ,ni through e larger part dwing space than lie drier steam and being declined 'toward the coolest Wetter drum to Capel-ile ci dieciierging Water thereinto and d supernesiter te "eid en -f i in te l In ccnibineticn, 'Water tiibe elemente .iec'ted to two upper Water deurne, emprisi' ft' ej eige@ end e heating space, and valve means for controllling communication between said superheater and coolerwater drum.

17. In combination, water tube elements connected Vto two upper walter drums, a heater oomprising a heat-ing space and a drying space, the drying Space being connected at one end to the hot-ter water drum .and at the other end to the cooler water drum and being declined toward the cooler water dnum, 10 a superheater anda connection from said coolerwater drum to said superheater.

In witness whereof I have hereunto set my hand in the presence of "awo witnesses. LEBREGHT STEINMLLER. Witnesses:

WOLDEMAR HAUTT, HENRY HASPER. 

